Copenhagen Airport

Do you mean to buy a completely separate ticket for this onward travel to Berlin ? This doesn't sound like a connecting flight.

I don't know an international airport in the world where you could make a separately ticketed flight only one and a half hours after your scheduled arrival into the airport.

If these will be two separate tickets and you miss the connection, you will have to buy a new ticket to Berlin at the last minute fare which is never low.

You will go through immigration (passport control) at Copenhagen as you are entering the Schengen area. You will also have to go through airport security.

If you have checked luggage you will also have to retrieve it and then recheck it back it.

Here is information on the transfer process at CPH:

https://www.cph.dk/en/flight-information/transfer

If you don't already have your flight to Europe, I'd suggest looking for a better connection to Berlin.

If you take a flight several hours after arriving at CPH, you could take the 15-minute train into Copenhagen. You can store your luggage in lockers at CPH Airport and also at Copenhagen Centraal train station.

Have fun in Europe!

IF your flight from US is on time, that's enough time to make a CPH connection. However, American & SAS are not in the same alliance, so I would be surprised if it's one ticket. Agree with other posters, you might not make your connecting flight and SAS has no obligation to put you on another flight, You arriving late / getting stuck at immigration, etc is not their responsibility. Some people buy 'throw away tickets', that are super cheap and they don't mind if they lose their connection. Good luck! (Or, look into cancelling & rebooking American to Berlin, stopover dictated by them, usually no change fee.)

If it's a single ticket, that's plenty of time and nothing to worry about. But I don't know if SAS and American airlines have an interlining agreement.

Copenhagen is an efficient airport with short distances, so on two separate tickets it should work, assuming your first flight is on time. But flights can be delayed. And you also need to go through immigration, and I'm not sure how long that will take.

IF your flight from US is on time, that's enough time to make a CPH connection.

If these are connecting flights, which it is not at all clear these are. That is why I asked OP for clarification in the very first response.